Microwave Spectrum of the SO Radical. Equilibrium S-O Distance, Electric Quadrupole Coupling Constant and Magnetic Hyperfine Structure Constants

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The molecular constants in the first excited vibrational state of the ³²SO radical are obtained as well as in the ground state. The equilibrium constants are much improved; B_e=21609.5₅±0.15 Mc/sec, λ_e=157780±25 Mc/sec, and r_e=1.48108±0.00005Å. Spectra of other two isotopic species, ³⁴SO and ³³SO, are also analyzed. Hyperfine interaction due to the ³³S nucleus is studied in detail, and (Remark: Graphics omitted.), (Remark: Graphics omitted.), (Remark: Graphics omitted.) are obtained. The Stark effect of the ³³SO spectra is worked out in detail and utilized for the assignment of the weak lines.